Automatic stopping system of power looms



Nov. 12, 1929. J, o ou 1,735,814

AUTOMATIC STOPPING SYSTEM OF POWER LOOMS Filed April 23, 1928 J 737mm,

mi, 7 W

Patented 12, 1929 UNITED STATES PATENT OFFICE J'ITSUZO TORQUE, 0F NAGOYA, JAPAN, ASSIGNOB TO 'IOYODASHIKI snom KABU- SHIKl-KAISHA, OI NAGOYA, JAPAN, A. CORPORATION OF JULIAN LU'IOIATIQSTOPPING SYSTEH 0F POWERJDOKS Application fled April 28, 1928, Serial No. 272,338, and in Japan October 8; 1927.

This invention relates to improvements in an automatic'stopping system of power looms comprising electrical means by which the loom stops its motion when a warp thread is I broken or abnormally slacked.

A known electrical stopping mechanism consists of an electric magnet which controls the operating mechanism of stopping motion and a circuit for the electric magnet, which circuit is closed when a dropper or wireheald drops due to breaking of the corresponding warp thread. 7

In his invention the electric magnet for the operating mechanism of stopping motion is not directly actuated b the circuit which comprises wire-heald, but it is actuated by the relay which in turn is actuated by the circuit comprising wire-healds.

Further in this invention a supplementary circuit is provided in parallel with the circuit of wire-healds, and this new circuit is closed when the relay is once actuated by the circuit of wire-healds, so that the relay keeps its acting position although the main circuit of wirehealds may he accidentally opened.

An object of this invention is to have the stopping mechanism start steadily and reliably by a weak electric current which passes through a wire-heald. A further object of this invention is to minimize sparkling at a wire-heald which, while it is closing an electric circuit, may accidentally break the latter'due-to vibration of the loom causing sparking at the contact points.

- In the accompanyin drawing, Fig. 1 is a diagrammatic view 0 the automatic stopping system for power looms according to this invention.

- Fig. 2 is a side elevation of wire-healds showing how a circuit is closed when a warp thread is broken.

Fig. 3 is a plan view of an operating mechanism stopping motion, taken on the line III-III in Fig. 1.

Figs. 4 and5 are diagrammatic views of two modifications according to this invention.

Fig. 1, 1 is a spring handle fixed to the frame 2 of a power loom and extends upwards through a stepped slot in a handle-bracket 3 as in the usual case. A rocking lever 4 is pivoted at 4 on the bracket, and a short pin 5 is horizontally' and slidably held at its right end. This end always hangs downwards due to unbalanced weight, but is raised upwards when its lift end in the form of a flat iron piece 4 is pulled by an electric magnet C,, so that the horizontal pin occupies a position before the spring handle and in the way of a projection 6 provided on the slay 7 of the loom.

Two contact pieces 8 and 9 are fixed beneath the handle-bracket electrically insulated from one another, between which a switching knife 10 on the spring handle is inserted while the loom is running.

A relay comprising an electric maget G a spring iron piece 11 with a switching knife 12 and two contact pieces 13 and 14 are provided at a proper position on the frame, and the main electric circuit for the magnet C consists of the lines 15, 17 the contacting ieces 9, 10 and 8, line 18, batteries B and the line 16, wire-healds bein inserted between the hnes 15 and 16 as s own in Figs. 2 and 3.

The circuit for the magnet C consists of the line 19, the contact pieces 13 and 12, spring iron piece 11, line 20, the batteries B the line 18, the contact pieces 8, 10 and 9, and the line 21 so that if the spring iron piece 11 is not pulled by the magnet C, to close the space between the pieces 13 and 14, this circuit is not closed and the magnet C, is not energized.

When the contact pieces 13 and 14 are electrically connected by means of the knife 12, that is to say when the spring plate 11 is pulled by the magnet 0,, the circuit for the magnet C, is closed as above mentioned. At the same time another or supplementary electric circuit for the magnet C is closed, which circuit consists of the contact pieces 12 and 14, coils of the magnet C the line 17 contact pieces 9, 10 and 8, the line 18, the batteries B,, the line 20 and the sprmg piece 11. It is noted that the three circuits abovening position. It is further noted that the from the frame, but is electrically connected to a rod 25 by means of a cord 26. Rods 25 and 27 are firmly fixed to the frame of healds vertically, and the rod 27 is electrically cons nected-with a side piece 22 of the frame, but the other rod is insulated from the frame.

Each rod provides contact pieces 28 and 29,

res ectively, and slides .up and down toget er with the frame 22. 30 and 31 are contact pieces which are connected to the lines 15 and 16, respectively. The positions 'of the pieces 30 and 31 relative to the pieces 28 and 29 are such that when the frame 22 is the lowest position the pair of contact pieces 28 and 29 are in contact with the pieces 30 and 31 respectivel as shown in full lines in Fig. 2, but if the firame is in any other position than the lowest one, the contact pieces 30 and 31are not bridged'and the circuit is not closed.

When the loom is running in good condition, all the wire-healds are pulled upwards by the tension of warp threads when the frame 22 is in the lowest position. If a thread is broken or abnormally slackened, the wireheald for that thread is not pulled upwards even when the frame is inthe lowest position, but drops as shown by Fig. 2, so that the rods 23 and 24 are electrically connected by the dropped wire-heald, thus an electric cir cuit is closed when the frame comes to the lowest.position, by the rod 25, cord 26, the

" rod 24,- wire-heald H the rod 23, the side piece 22 of the frame, the rod 27 ,the pair of contact pieces and the lines 15 and 16.

When the lines 15 and 16 are electrically closed, the electric ma et 0 is energized, and the spring piece,11 is pulled so as to make a contact of the knife 12 with the pieces 13 and 14. By this contact the supplementary circuit is closed and current for the magnet j C, can, pass through either or both of the main and supplementary currents and so that the contact is made more'steady and reliable. At the same time the magnet 0 is energized and pulls the iron piece 4;? bringing the horizontal spindle 5 in the way of the projection 6 of the slay. At the end of the next stroke of the slay, the projection 6 strikes the horizontal spindle 5, which in turn strikes the spring handle -1, and the latter changes its position breaking all the circuits as shown in dotted lines in Fig. 1,-

and the looms motion is stopped as in the usual way.

In the modification shown in Fig. 4, different batteries B and B, are used for the magnets C, and 0,, respectively. The pull of a spring-iron-piece 13" by the magnet C closes an independent circuit for the ma et 0,. This modification is preferably adopted when a high voltage electric current is used for the magnet of a stopping mechanism while a low voltage electric current is used for the relay.

In the other modification shown in Fig. 5, a single magnet is used for both stopping mechanism and relay. In this case an electric circuit for the magnet O, in Fig. 1, is of course eliminated.

According to this invention, when the wire-heald is accidentally open due to vibration of the loom, no sparking would be caused at the contact point, otherwise the point would be injured.

Claims I 1. In an automatic stopping system for power looms, the combination with the wirehealds which are pulled upwardly by the tensioning of the war thread, and a rod arranged in juxtaposition to the healds, the said rod being in the path of downward movement of a dropped one of said healds, the heald frame of the loom including a metallic rod spaced above the first mentioned rod whereby the metallic wire heald, in dropped position, will brid e the two rods, a pair of contacts supporte in spaced relation to each other, conductor rods extending upwardly from the heald frame, cmtacts carried by the conductor rods and ngageable with respective ones of the-first men tioned contacts, one of said conductor rods being in circuit with the first mentioned rods, the rod of the heald frame being in circuit with a metallic part of said frame constituting also an electrical conductor and the other one of the conductor rods being in circuit with said metallic parts, another pair of spaced contacts, an electro-ma et arranged in 'uxtaposition thereto, one 0 said contacts and one terminal of the winding of the magnet being in circuit with one of the first mentioned contacts and likewise with one of. the last mentioned contacts, an electro-magnet having one terminal in circuit with the other one of the second mentioned contacts, the said electro-magnetembodying an armature having means for bridging the second mentioned contacts when the electro-magnet is energized, a second electro-magnet in circuit with the other one of the second mentioned contacts and having an armature pivmentioned elect-ro-magnet bein from, a switch including spaced terminals one of which is in circuit with the second mentioned electro-magnet, and one terminal of the magnet the other terminal of the first in circuit with the said other terminal 0 the second mentioned magnet, a source of current supply in circuit with the other one of the bridge contacts and with the other one of the first mentioned contacts, an actuating spring-handle for stopping the motion of the loom, the said spring handle being provided with a conductor element for bridging the bridge contacts when the second mentioned electromagnet is energized, operative connection between the armature 0 said magnet and the handle efi'ectin the release of the arm and its movement t rough its resiliency upon energization of the second mentioned magnet, and another circuitincluding an electro-magnet, a source of current supply therefore, a switch comprising contacts corresponding to the second mentioned contacts and a bridgin means therefore in common, with the bridging means of the armature of the second mentioned electro-magnet, and means, actuated throughthe movement of the sprin handle for stopping motion, to break all 0 said circuits.

2. An automatic stopping system for power looms, comprising a circuit including an electric magnet, a. spring-handle, controlling mechanism for said handle, the energization of said magnet eifecting actuation of the said controlling mechanism of the spring handle, which latter is for stopping motion, a relay unit which includes an electric magnet and contact pieces for the circuits of the two electric magnets, two electric circuits including a source of current supply, the coils of the relay magnet being common to each circuit, and means for automatically closing one of the circuits through the relay when a war thread is broken.

3. n automatic system for power looms, comprising, a circuit including an electric magnet, a spring-handle, controlling mecha nism for said handle, the energization of said magnet efi'ecting actuation of the said controlling mechanism of the spring handle, which latter is for stopping motion, the circuit for the magnet including an independ ent 'source ofcurrent supply, a relay unit including an electric magnet and contact pieces for the circuits of the two electric magnets, two electric circuits including a source of current supply, the coils of the re lay being common to each circuit, and means 0 erable to automatically close one of the circuits of the relay when a warp thread is broken.

4. An automatic stopping system for power looms, comprising a circuit mcludin an electromagnet, a s

mechanism for sai handle, the energization ring handle, contro ling. 

